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<front>
<journal-meta>
<journal-id>0365-6691</journal-id>
<journal-title><![CDATA[Archivos de la Sociedad Española de Oftalmología]]></journal-title>
<abbrev-journal-title><![CDATA[Arch Soc Esp Oftalmol]]></abbrev-journal-title>
<issn>0365-6691</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Española de Oftalmología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0365-66912008001200003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El asesoramiento genético en los déficits visuales y auditivos]]></article-title>
<article-title xml:lang="en"><![CDATA[Genetic counselling in visual and auditory disorders]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Millán]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aller]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jaijo]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Grau]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
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<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Beneyto]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nájera]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Universitario La Fe Unidad de Genética ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Valencia Departamento de Genética ]]></institution>
<addr-line><![CDATA[Valencia ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER)  ]]></institution>
<addr-line><![CDATA[Valencia ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>83</volume>
<numero>12</numero>
<fpage>689</fpage>
<lpage>702</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0365-66912008001200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0365-66912008001200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0365-66912008001200003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Objetivo: Las enfermedades hereditarias que afectan a la retina y la audición presentan una amplia heterogeneidad clínica y genética. Durante la pasada década se han producido importantes avances en el conocimiento de la patogenia molecular de estas enfermedades y, actualmente, más de 200 genes y loci están implicados en enfermedades de la retina y más de 60 son responsables de pérdida de audición. Método: El estudio genético molecular es crucial para confirmar el diagnóstico clínico, permite, en ocasiones, conocer el pronóstico de la enfermedad, un consejo genético y reproductivo adecuado y permite la posibilidad de crear grupos de pacientes genéticamente homogéneos para futuros ensayos clínicos. Resultados: El elevado número de genes implicados hace que el diagnóstico molecular no sea factible en términos de coste, tiempo y esfuerzo técnico y no existe ningún centro que oferte el análisis de todos los genes conocidos. Recientemente, se han desarrollado varias herramientas diagnósticas dirigidas a paliar este problema. Conclusiones: En este trabajo se ha revisado la amplia heterogeneidad genética de las distrofias retinianas y la hipoacusia, los recientes descubrimientos de nuevos genes, las distintas herramientas diagnósticas basadas en microchips de ADN, sus ventajas y limitaciones y los nuevos avances en busca de una terapia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Purpose: Inherited retinal dystrophies and hearing loss disorders have a broad clinical and genetic heterogeneity. Over the last decade there have been major advances in our understanding of the molecular pathology of these diseases; currently over 200 genes and loci are known to be involved in retinal disorders, and over 60 genes/loci are causative for hearing impairment. Methods: Genetic testing is crucial for confirming the diagnosis at a molecular level. It also allows a more precise prognosis to be made of the future clinical evolution, as well as an accurate genetic and reproductive counselling, and raises the possibility of creating genetically homogeneous groups of patients for future clinical trials. Results: The high number of genes responsible for these disorders makes molecular testing overwhelming in terms of cost, time and technical effectiveness, and no centre offers testing of all known genes. Several diagnostic tools have emerged recently to circumvent this problem. Conclusions: In this report, we review the vast genetic heterogeneity of retinal dystrophies and hypoacusis, recent advances in gene discovery, the different DNA-based microarray technologies available for molecular testing, their benefits and limitations, and novel therapeutic approaches.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Consejo genético]]></kwd>
<kwd lng="es"><![CDATA[distrofias hereditarias de retina]]></kwd>
<kwd lng="es"><![CDATA[hipoacusias]]></kwd>
<kwd lng="es"><![CDATA[riesgo de recurrencia]]></kwd>
<kwd lng="es"><![CDATA[futuras terapias]]></kwd>
<kwd lng="en"><![CDATA[Genetic counselling]]></kwd>
<kwd lng="en"><![CDATA[inherited retinal dystrophies]]></kwd>
<kwd lng="en"><![CDATA[hearing loss]]></kwd>
<kwd lng="en"><![CDATA[recurrence risk]]></kwd>
<kwd lng="en"><![CDATA[future therapies]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><b><font face="Verdana" size="2"><a name="top"></a>REVISIÓN</font></b></p>     <p>&nbsp;</p>     <p><b><font size="4" face="Verdana">El asesoramiento genético en los déficits visuales y auditivos</font></b></p>     <p><B><font face="Verdana" size="4">Genetic counselling in visual and auditory disorders</font></B></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><B>Millán J.M.<sup>1</sup>, Aller E.<sup>1</sup>, Jaijo T.<sup>2</sup>, Grau E.<sup>3</sup>, Beneyto M.<sup>4</sup>, Nájera C.<sup>5</sup></B></font></p>     <p><font size="2" face="Verdana">Unidad de Genética. Hospital Universitario La Fe y Departamento de Genética. Universidad de Valencia y Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER). Valencia. España.    <BR><sup>1</sup> Doctor en Ciencias Biológicas.    <BR><sup>2</sup> Licenciada en Bioquímica.    ]]></body>
<body><![CDATA[<BR><sup>3</sup> Licenciada en Ciencias Biológicas.    <BR><sup>4</sup> Licenciada en Medicina.    <BR><sup>5</sup> Doctora en Ciencias Biológicas. Licenciada en Farmacia.</font></p>     <p><font size="2" face="Verdana">Proyecto subvencionado PI07/0558 del Fondo de Investigación Sanitaria (FIS).</font></p>     <p><font face="Verdana" size="2"><a href="#bajo">Dirección para correspondencia</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p><hr size="1">     <p><B><font size="2" face="Verdana">RESUMEN</font></B></p>     <p><font size="2" face="Verdana"><b>Objetivo:</b> Las enfermedades hereditarias que afectan a la retina y la audición presentan una amplia heterogeneidad clínica y genética. Durante la pasada década se han producido importantes avances en el conocimiento de la patogenia molecular de estas enfermedades y, actualmente, más de 200 genes y loci están implicados en enfermedades de la retina y más de 60 son responsables de pérdida de audición.    <BR><b>Método:</b> El estudio genético molecular es crucial para confirmar el diagnóstico clínico, permite, en ocasiones, conocer el pronóstico de la enfermedad, un consejo genético y reproductivo adecuado y permite la posibilidad de crear grupos de pacientes genéticamente homogéneos para futuros ensayos clínicos.    ]]></body>
<body><![CDATA[<BR><b>Resultados:</b> El elevado número de genes implicados hace que el diagnóstico molecular no sea factible en términos de coste, tiempo y esfuerzo técnico y no existe ningún centro que oferte el análisis de todos los genes conocidos. Recientemente, se han desarrollado varias herramientas diagnósticas dirigidas a paliar este problema.    <BR><b>Conclusiones:</b> En este trabajo se ha revisado la amplia heterogeneidad genética de las distrofias retinianas y la hipoacusia, los recientes descubrimientos de nuevos genes, las distintas herramientas diagnósticas basadas en microchips de ADN, sus ventajas y limitaciones y los nuevos avances en busca de una terapia.</font></p>     <p><font size="2" face="Verdana"><b>Palabras clave:</b> Consejo genético, distrofias hereditarias de retina, hipoacusias, riesgo de recurrencia, futuras terapias.</font></p> <hr size="1">     <p><B><font size="2" face="Verdana">ABSTRACT</font></B></p>     <p><font size="2" face="Verdana"><B>Purpose:</B> Inherited retinal dystrophies and hearing loss disorders have a broad clinical and genetic heterogeneity. Over the last decade there have been major advances in our understanding of the molecular pathology of these diseases; currently over 200 genes and loci are known to be involved in retinal disorders, and over 60 genes/loci are causative for hearing impairment.    <BR><B>Methods:</B> Genetic testing is crucial for confirming the diagnosis at a molecular level. It also allows a more precise prognosis to be made of the future clinical evolution, as well as an accurate genetic and reproductive counselling, and raises the possibility of creating genetically homogeneous groups of patients for future clinical trials.    <BR><B>Results:</B> The high number of genes responsible for these disorders makes molecular testing overwhelming in terms of cost, time and technical effectiveness, and no centre offers testing of all known genes. Several diagnostic tools have emerged recently to circumvent this problem.    <BR><B>Conclusions:</B> In this report, we review the vast genetic heterogeneity of retinal dystrophies and hypoacusis, recent advances in gene discovery, the different DNA-based microarray technologies available for molecular testing, their benefits and limitations, and novel therapeutic approaches <i>(Arch Soc Esp Oftalmol 2008; 83: 689-702).</font></i></p>     <p><font size="2" face="Verdana"><b>Key words:</b> Genetic counselling, inherited retinal dystrophies, hearing loss, recurrence risk, future therapies.</font></font></p> <hr size="1">     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><B><font face="Verdana">Introducción</font></B></p>     <p><font size="2" face="Verdana">Las enfermedades derivadas de la pérdida de visión y audición de causa genética, constituyen uno de los problemas más importantes para los sistemas públicos de salud. Por otra parte, son enfermedades que afectan a órganos necesarios para la comunicación y, por lo tanto, pueden suponer un alto grado de aislamiento social.</font></p>     <p><font size="2" face="Verdana">Cada vez son más frecuentes las parejas que acuden a los servicios de Oftalmología, Otorrinolaringología o a las consultas de Genética en busca de asesoramiento porque hay antecedentes de alguna retinopatía o problemas de audición en la familia, en uno de los miembros de estas parejas o han tenido previamente un hijo con alguno de estos problemas.</font></p>     <p>&nbsp;</p>     <p><B><font face="Verdana">Sujetos, material y métodos</font></B></p>     <p><B><font size="2" face="Verdana">Asesoramiento genético</font></B></p>     <p><font size="2" face="Verdana">El asesoramiento genético, mal llamado consejo genético (traducción del término inglés <i>Genetic Counselling</i>) consiste en ofrecer la información médica y científica disponible a aquellas personas afectadas por una enfermedad o con riesgo de padecer o transmitir una determinada enfermedad a su descendencia, incluyendo las posibles medidas para tratar o retrasar los síntomas de la enfermedad y evitar la transmisión de la misma. El genetista no aconseja al paciente, le ofrece la información disponible para que éste decida. El asesoramiento genético supone:</font></p>     <blockquote> 	    <p><font size="2" face="Verdana">1. Alcanzar un diagnóstico de la enfermedad: éste es el primer paso, difícil en ocasiones y especialmente en las enfermedades neurosensoriales porque fenómenos como la expresividad variable, que se explicará más adelante, afectan este tipo de enfermedades. Sin un correcto diagnóstico clínico, el asesoramiento será incompleto e impreciso.</font></p> 	    <p><font size="2" face="Verdana">2. Estima del riesgo. Tanto de desarrollar la enfermedad como de transmitirla a la descendencia.</font></p> 	    ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">3. Ayuda especializada que incluye la consulta con médicos clínicos especialistas, en ocasiones ayuda psicológica y la oferta del diagnóstico genético prenatal o del diagnóstico genético preimplantacional.</font></p> </blockquote>     <p><font size="2" face="Verdana">Este último punto implica la realización de análisis de genética molecular. El diagnóstico genético prenatal consiste en la detección de la mutación o mutaciones responsables de la enfermedad en el embrión realizando una biopsia corial (entre las semanas 11-13 de gestación) o una amniocentesis (semanas 15-16).</font></p>     <p><font size="2" face="Verdana">El diagnóstico genético preimplantacional implica la implantación en el útero de embriones libres de la enfermedad con lo cual se evita el aborto terapéutico. Consiste en la fecundación in vitro de óvulos, previamente extraídos de la futura madre, con esperma de su pareja. Cuando los embriones tienen entre 6 y 8 células, se extrae una de ellas y se analiza para la presencia del defecto genético detectado previamente en la pareja. Se implantará únicamente aquel o aquellos embriones libres del defecto.</font></p>     <p><font size="2" face="Verdana">Para que este diagnóstico, prenatal o preimplantacional, sea posible, es necesario conocer previamente cuál es el defecto genético implicado en la familia; no sólo qué gen está alterado sino la mutación o mutaciones concretas de este gen presentes en la persona afectada.</font></p>     <p><font size="2" face="Verdana">Las pruebas genéticas, como veremos a continuación, no son sencillas y en el caso de las enfermedades neurosensoriales, en muchas ocasiones, son irrealizables con los medios disponibles actualmente.</font></p>     <p><font size="2" face="Verdana">En un primer momento se pensó que una enfermedad (una entidad clínica) era causada por un único gen, así, se buscaba el gen de la retinosis pigmentaria, el gen del síndrome de Usher, el de la maculopatía, etc. Posteriormente, el desarrollo de la genética molecular ha puesto, y continúa poniendo de manifiesto desde las últimas dos décadas, una enorme heterogeneidad genética de ambos problemas, hipoacusia y ceguera, que implica que el asesoramiento genético en las familias en las que existen antecedentes de estas enfermedades y muy especialmente en los casos esporádicos, sea muy complicado.</font></p>     <p><font size="2" face="Verdana">Los avances producidos en la investigación de los genes implicados y los mecanismos patogénicos de estas enfermedades no se corresponden con las posibilidades de estudio de las mismas en los laboratorios asistenciales. De hecho, existen hasta la fecha más de 180 genes implicados en degeneraciones retinianas, sindrómicas y no sindrómicas. Las distrofias retinianas constituyen el núcleo de los problemas hereditarios relacionados con la visión, tanto por su prevalencia, su complejidad y la ausencia de tratamiento, y nos centraremos en ellas. A modo de ejemplo, una entidad clínica como la retinosis pigmentaria (RP) presenta los tres patrones mendelianos de transmisión hereditaria y hasta la fecha se han identificado 14 genes para las formas autosómica dominante, 19 para la forma autosómica recesiva y 2 ligadas al cromosoma X; para la amaurosis congénita de Leber existen 15 genes responsables y se supone que queda al menos uno más por identificar, además su patrón de transmisión puede ser autosómico dominante o recesivo. Se han identificado 9 genes distintos para el síndrome de Bardet-Biedl (1), otros 9 para el síndrome de Usher (2), enfermedad en la que se asocian los dos déficits, visual y auditivo, que tratamos en este trabajo y, al menos dos para la enfermedad de Refsum, una rara enfermedad peroxisomal que también asocia sordera con RP además de neuropatía periférica, anosmia, ataxia cerebelosa y, en algunos casos, displasia esquelética, ictiosis, cataratas y arritmias cardíacas (3). La causa de la enfermedad es la acumulación de ácido fitánico al fallar el proceso de degradación del mismo.</font></p>     <p><font size="2" face="Verdana">En el contexto de esta visión general de las distrofias retinianas, cabe mencionar la amplia diversidad de funciones que las proteínas implicadas desempeñan (<a href="#t1">tabla I</a>). De todos estos genes, un cierto número codifican proteínas implicadas en la fototransducción, incluyendo la rodopsina, las subunidades alfa y beta de la fosfodiesterasa dependiente del GMP cíclico, las subunidades alfa y beta del canal iónico dependiente del GMP cíclico específico de bastones, la arrestina, etc.</font></p>     <p align="center"><font size="2" face="Verdana"><a name="t1"><img border="0" src="/img/revistas/aseo/v83n12/t03-01.gif" width="600" height="1555"></a></font></p>     <p><font size="2" face="Verdana">Otras intervienen en el ciclo de la vitamina A. Están involucradas en los procesos de transporte e isomerización del 11-cis-retinal a todo-trans-retinal, bien en el interior del fotorreceptor, bien en el epitelio pigmentario de la retina (EPR). Hemos englobado estas proteínas dentro del metabolismo del ciclo visual, incluyendo en este apartado la proteína <i>MERKT</i>, implicada en la fagocitosis de los discos de opsina del segmento externo de los fotorreceptores en el EPR, en tanto que, aunque no forme parte directamente de la maquinaria proteica responsable del metabolismo de los retinoides, forma parte, al igual que estas, de los procesos que ocurren entre el segmento externo del fotorreceptor y el EPR.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Una tercera función representada por genes implicados en las retinopatías es el desarrollo de la retina misma. Por ejemplo, <i>CRX</i> y <i>NRL</i> son factores de transcripción que parecen estar implicados, individual o sinérgicamente, en la regulación de la expresión de otros genes específicos de retina como la rodopsina.</font></p>     <p><font size="2" face="Verdana">Recientemente, se ha comprobado que mutaciones en algunos genes implicados en el procesado de pre-RNA mensajero producen RP. Resulta interesante que estos genes, <i>PRPF3, PRPF8</i> y <i>PRPF31</i> se expresan de forma ubicua en el organismo, sin embargo, sólo causan un fenotipo patológico en la retina.</font></p>     <p><font size="2" face="Verdana">El mayor porcentaje de genes implicados en distrofias retinianas tienen función estructural. Son proteínas implicadas en la correcta disposición de las estructuras tridimensionales del fotorreceptor, los discos de opsina (RDS-periferina y <i>ROM1</i>), el cilio conector y la región periciliar <i>(TULP1, USH2A, CRB1, FSCN2, RP2, RPGR, RPGRIP1) </i>importante para el tráfico de proteínas desde el segmento interno al externo, el anclaje del fotorreceptor al RPE, etc.</font></p>     <p><font size="2" face="Verdana">Además, algunos genes están implicados en la integración de la información visual, el control de la apoptosis y otras funciones aún desconocidas.</font></p>     <p><font size="2" face="Verdana">En cuanto a las hipoacusias neurosensoriales, se han identificado más de 25 genes implicados en las formas no sindrómicas y más de 20 en hipoacusias sindrómicas lo que hace que el rastreo del gen o genes implicados en la enfermedad de una familia concreta sea, en aproximadamente la mitad de los casos, virtualmente imposible. La <a href="#t2">tabla II</a> muestra los principales genes implicados en hipoacusias hereditarias no sindrómicas, su localización cromosómica, su función y si esos genes son responsables además de alguna forma de hipoacusia sindrómica como ocurre en las retinopatías.</font></p>     <p align="center"><font size="2" face="Verdana"><a name="t2"><img border="0" src="/img/revistas/aseo/v83n12/t03-02.gif" width="600" height="499"></a></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Además, todavía existen muchos otros genes implicados en estas patologías que están ya localizados, es decir, se conoce la región cromosómica donde se encuentran, pero todavía no han sido caracterizados y, por tanto, no es posible su cernimiento mutacional.</font></p>     <p><font size="2" face="Verdana">Para ver con mayor detalle y en constante proceso de actualización los genes identificados y localizados para las distintas formas de transmisión hereditaria de las hipoacusias hereditarias aconsejamos visitar la página web de <i>Hereditary Hearing Loss Homepage:</i></font></p>     <p><font size="2" face="Verdana">http://webh01.ua.ae.be/hhh/</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">y para las enfermedades retinianas, RetNet:</font></p>     <p><font size="2" face="Verdana"><a target="_blank" href="http://www.sph.uth.tmc.edu/Retnet/">http://www.sph.uth.tmc.edu/Retnet/</a></font></p>     <p>&nbsp;</p>     <p><B><font face="Verdana">Resultados</font></B></p>     <p><font size="2" face="Verdana">Considerando las posibilidades y herramientas actuales y las excepciones a las leyes mendelianas de la herencia que ha demostrado la experiencia, detallamos a continuación un breve resumen de las posibilidades de estudio de estas enfermedades.</font></p>     <p><B><font size="2" face="Verdana">Pruebas genéticas asumibles por los laboratorios asistenciales</font></B></p>     <p><font size="2" face="Verdana">Los estudios que se ofertan en los laboratorios de genética asistenciales dependen de varios factores:</font></p>     <p><font size="2" face="Verdana">El número y complejidad de los genes implicados en la enfermedad. Como ya hemos visto en el caso de las distrofias de la retina y las hipoacusias, ambos factores afectan muy negativamente a la posibilidad de realizar pruebas genéticas sencillas.</font></p>     <p><font size="2" face="Verdana">Debido quizás a la complejidad anatómica y fisiológica de ambos órganos, el ojo y el oído, y a la cantidad de proteínas y genes que son necesarios para el correcto funcionamiento de los mismos, la detección del defecto genético responsable del déficit en cada paciente es una tarea muy ardua.</font></p>     <p><font size="2" face="Verdana">Dentro de la complejidad de ambos problemas, existe una diferencia importante entre las hipoacusias y las retinopatías.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">En las hipoacusias el 80% de los casos hereditarios corresponde a un patrón autosómico recesivo. Además, cinco mutaciones, 35delG en el gen GJB2, del (D13S1854) y del (D13S1830) en el gen GJB6, la mutación 1555G&gt;A del gen mitocondrial r12S y la mutación Q829X del gen OTOF están presentes en cerca del 50% de los casos de hipoacusia en España (4) y, por lo tanto, un cernimiento relativamente sencillo de estas 5 mutaciones permite el asesoramiento genético en un buen número de familias con antecedentes de hipoacusia.</font></p>     <p><font size="2" face="Verdana">El caso de las retinopatías es mucho más complicado. No existe un patrón de transmisión tan prevalente como las hipoacusias ni hay ningún gen responsable de un porcentaje alto de retinopatías (5).</font></p>     <p><font size="2" face="Verdana">Estos problemas hacen que en la actualidad el estudio de estas enfermedades sea absolutamente dependiente de financiación derivada de proyectos de investigación, no sólo en cuanto a material fungible e inventariable sino, sobre todo, de personal.</font></p>     <p><B><font size="2" face="Verdana">Problemas derivados de las formas de transmisión no clásicas: Alteración del riesgo de recurrencia teórico</font></B></p>     <p><font size="2" face="Verdana">Tanto para las enfermedades hereditarias retinianas como para las hipoacusias neurosensoriales, existen ejemplos de transmisión hereditaria que siguen los 3 patrones clásicos mendelianos: formas autosómicas dominantes, autosómicas recesivas y ligadas al sexo. Además existen formas de retinopatías e hipoacusias asociadas a problemas mitocondriales.</font></p>     <p><font size="2" face="Verdana">Sin embargo, hay una serie de fenómenos sobradamente conocidos por los genetistas, que se dan en este tipo de enfermedades y que alteran estos modelos de transmisión hereditaria, complicando aún más el asesoramiento genético: El pleiotropismo, es relativamente frecuente. Ejemplos de este fenómeno pueden ser la mayoría de los genes implicados en el síndrome de Usher que, dependiendo del tipo de mutación, afectan al oído, a la retina o a ambos. Como puede apreciarse en la <a href="#t1">tabla I</a>, algunos genes pueden dar lugar a retinosis pigmentaria, enfermedad de Stargardt y degeneración macular asociada a la edad (6). La penetrancia incompleta es un fenómeno frecuente en el síndrome de Waardenburg (7). La expresividad variable también es un fenómeno frecuente tanto en retinopatías como en hipoacusias. Por ejemplo, los pacientes que tienen la mutación 35delG en el gen GJB2, presentan una hipoacusia que puede ir desde moderada a severa (8,9) o el conjunto de afectados de retinosis pigmentaria con mutaciones en el gen de la rodopsina pueden presentar un inicio variable de la enfermedad y mayor o menor grado de pérdida de campo visual incluso entre afectos de la misma familia (9). Otro fenómeno que afecta exclusivamente a las formas ligadas al sexo es la lyonización o inactivación aleatoria del cromosoma X. Este fenómeno podría explicar el hecho de que algunas mujeres portadoras presenten síntomas de la enfermedad a veces tan graves como un varón afectado por una retinopatía ligada al cromosoma X. Menos frecuentes son los casos de disomía uniparental, aún así, se ha detectado un caso de disomía uniparental parcial del cromosoma 1 que ha dado lugar a la enfermedad de Stargardt en un paciente (10,11) y un caso similar en el cromosoma 13 ha dado lugar a hipoacusia debida a mutaciones en el gen GJB2 en hermanos de la misma familia (12). Por último, se han detectado casos de herencia digénica en retinopatías entre las proteínas periferina/RDS y Rom-1, dos proteínas integrantes de los discos de los segmentos externos de los fotorreceptores de la retina (13) e hipoacusia entre las conexinas 26 y 30 (14), aunque recientemente el modelo de herencia digénica para estas conexinas se ha puesto en duda (15).</font></p>     <p>&nbsp;</p>     <p><B><font face="Verdana">Discusión</font></B></p>     <p><B><font size="2" face="Verdana">Limitaciones y beneficios del asesoramiento genético</font></B></p>     <p><font size="2" face="Verdana">La principal limitación es la derivada de la complejidad de las pruebas genéticas para la detección de la mutación o mutaciones responsables de la enfermedad en cada familia. Además, existen los problemas derivados de las posibles variaciones de las formas mendelianas de transmisión de la enfermedad.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Como se ha mencionado, no es posible hoy por hoy, que un laboratorio asistencial de genética pueda estudiar un número de genes que explique más del 50% de las hipoacusias hereditarias y de un porcentaje todavía menor de retinopatías. Incluso en laboratorios especializados y dedicados exclusivamente a estas patologías, el porcentaje de casos resueltos no llega ni con mucho a la totalidad de los casos.</font></p>     <p><font size="2" face="Verdana">Mientras no se desarrollen herramientas genéticas que permitan el estudio de un gran número de genes/mutaciones en un plazo de tiempo corto y con un coste razonable, no será posible.</font></p>     <p><I><font size="2" face="Verdana">Microchips de ADN</font></I></p>     <p><font size="2" face="Verdana">Una de estas herramientas, aparecida recientemente es el microchip de ADN. El microchip o microarray de ADN permite detectar un gran número de mutaciones en distintos genes a la vez con una pequeña muestra de ADN del paciente en muy corto espacio de tiempo (16-18). Esta labor mediante las técnicas habituales se demoraría meses. El problema es que estos microchips sólo detectan las mutaciones que se incorporan al mismo, no detecta mutaciones nuevas y, por lo tanto, en aquellos pacientes que tienen mutaciones no descritas previamente, el microchip no detectará nada. Para que la eficacia del microchip aumente es necesario el análisis mutacional de estos pacientes mediante los métodos «tradicionales» y actualizar el microchip mediante la incorporación de las nuevas mutaciones detectadas.</font></p>     <p><font size="2" face="Verdana">Otra herramienta surgida recientemente es el genotipado de alto rendimiento mediante SNPs (19). Este microchip de SNPs permite descartar mediante un estudio indirecto, un determinado número de genes implicados tanto en RP como en amaurosis congénita de Leber. Permite, en función del tamaño familiar, el número de afectados y la presencia o no de consanguinidad, descartar la implicación de un importante número de genes implicados en estas patologías lo que le convierte en una herramienta muy útil como primera aproximación al diagnóstico, sin embargo, no tiene utilidad en los casos esporádicos y no evita la secuenciación de los genes no descartados.</font></p>     <p><font size="2" face="Verdana">Un beneficio a medio plazo del diagnóstico molecular de las distrofias retinianas es la creación de grupos genéticamente homogéneos de pacientes sobre los que puedan aplicarse futuros ensayos clínicos y protocolos concretos de terapia génica.</font></p>     <p><B><font size="2" face="Verdana">Perspectivas en terapia</font></B></p>     <p><font size="2" face="Verdana">El beneficio de los estudios genéticos, ante la ausencia actual de una terapia que evite el desarrollo de la enfermedad, reside no sólo en la posibilidad de la realización del diagnóstico prenatal sino también en la creación de grupos homogéneos de pacientes, desde el punto de vista genético para futuros ensayos clínicos.</font></p>     <p><font size="2" face="Verdana">Cabe destacar que la investigación va encaminada a desarrollar terapias futuras, y estas investigaciones se abordan desde distintos puntos de vista.</font></p>     <p><I><font size="2" face="Verdana">Tratamiento de la hipoacusia neurosensorial</font></I></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">El tratamiento de la pérdida auditiva se contrarresta de dos formas distintas según el grado y carácter de la hipoacusia:</font></p>     <p><font size="2" face="Verdana">En pacientes que presentan hipoacusia entre leve y moderado-severa, los pacientes refieren mejora de la audición con la utilización de audífonos.</font></p>     <p><font size="2" face="Verdana">En pacientes que padecen sordera profunda congénita, y en pacientes en los que la hipoacusia es progresiva, alcanzando en estadios avanzados el grado de severo-profunda, se están aplicando con gran éxito los implantes cocleares.</font></p>     <p><I><font size="2" face="Verdana">Perspectivas de terapia para las degeneraciones retinianas</font></I></p>     <p><font size="2" face="Verdana">A diferencia de las hipoacusias, no existe en la actualidad ningún tratamiento farmacológico ni protésico que permita la recuperación del sentido dañado, aunque sí se están desarrollando diferentes estrategias terapéuticas dependiendo del estadio de la enfermedad en el que nos encontremos:</font></p>     <p><font size="2" face="Verdana">En etapas iniciales de la enfermedad se podrán aplicar tanto terapias para ralentizar el proceso degenerativo, mediante la aplicación de factores neurotróficos; como estrategias curativas, como son la terapia génica o los transplantes retinianos.</font></p>     <p><font size="2" face="Verdana">En los estadios finales en los que la degeneración de la retina está ya muy avanzada, únicamente serán de utilidad los transplantes de retina o los implantes visuales.</font></p>     <p><font size="2" face="Verdana">Factores neurotróficos</font></p>     <p><font size="2" face="Verdana">Estas sustancias protegen a las células retinianas de los procesos apoptóticos que desencadenan la muerte de las células retinianas. Es necesario que estos factores se administren de forma continuada y en dosis fisiológicas. Un gran avance en este aspecto, que está teniendo gran éxito en los primeros ensayos con humanos, es la utilización de las llamadas <i>células encapsuladas.</i> Se trata de la implantación en el globo ocular de una minúscula cápsula hecha de material poroso conteniendo células que liberan factores neurotróficos (20).</font></p>     <p><font size="2" face="Verdana">Terapia génica</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Consiste en la sustitución o reparación del gen defectivo mediante la introducción de material genético en las células afectadas por medio de un vector.</font></p>     <p><font size="2" face="Verdana">La estrategia será diferente en función de la forma de transmisión de la retinopatía. Así, en aquellos casos con herencia dominante, se trata de silenciar la expresión del gen mutado mientras que en los casos de herencia recesiva se ha de incorporar un gen no mutado y conseguir que se exprese de forma correcta.</font></p>     <p><font size="2" face="Verdana">Otra dificultad para la aplicación de la terapia génica viene dada por la expresión de estos genes. Algunos genes implicados en la enfermedad se expresan específicamente en retina. Para estos casos el problema estriba en la entrega del gen en la retina atravesando el resto de capas oculares.</font></p>     <p><font size="2" face="Verdana">Sin embargo, en muchos casos, el gen alterado presenta distintas isoformas y se expresa en varios tejidos distintos, a veces de forma ubicua e incluso en ocasiones, estos genes forman parte de la maquinaria responsable de la maduración y expresión de otros genes. A pesar de que estos genes se expresan en distintos tejidos o de forma sistémica, tan sólo producen patología en la retina, posiblemente porque la alteración ocurre tan sólo en la isoforma específica de este tejido aunque no pueden descartarse otras causas como la presencia de genes en estos tejidos distintos de la retina, que suplan la función del alterado. Para estos casos, la dificultad viene porque la modificación de la expresión de ese gen que en la retina es patológico, podría producir efectos adversos en la función de ese mismo gen en otros tejidos. Es necesario conocer los procesos biológicos por los que un gen expresa una isoforma concreta específicamente en un tejido o en un momento determinado del desarrollo de un tejido para desarrollar una terapia génica racional.</font></p>     <p><font size="2" face="Verdana">Otro problema es la baja eficiencia de transducción de los vectores. Por último, la sub- o sobrexpresión de algunos transgenes pueden dar lugar a una degeneración de los fotorreceptores (21).</font></p>     <p><font size="2" face="Verdana">Los últimos estudios indican que los vectores más eficaces para integrar de manera estable los transgenes en el genoma de las células retinianas y que presentan además un nivel alto y persistente de expresión son los <i>lentivirus</i> (22). Éstos han sido utilizados en los primeros experimentos de terapia génica para las distrofias retinianas que se han llevado a cabo en el ratón mutante <i>rd</i> mediante la introducción de GFP, una proteína fluorescente de fácil identificación en cortes histológicos, en células del epitelio pigmentario de la retina (23). Actualmente, se están llevando cabo dos ensayos clínicos mediante terapia génica, uno para la degeneración macular asociada a la edad (24) y otro para la amaurosis congénita de Leber debida a mutaciones en el gen <i>RPE65</i> (25). Ambos ensayos están en fase I y han demostrado que la inyección de ciertos vectores virales en el ojo es segura.</font></p>     <p><font size="2" face="Verdana">Transplantes de retina</font></p>     <p><font size="2" face="Verdana">– <i>Retinas artificiales:</i> se trata de un microchip de minúsculas dimensiones conteniendo células solares microscópicas capaces de convertir la luz en impulsos eléctricos. Éste se implanta mediante cirugía en el ojo del paciente, en un lateral subretiniano. Esta tecnología no es todavía aplicable para la cura de las deficiencias visuales, pero es un campo en el que las investigaciones están avanzando rápidamente.</font></p>     <p><font size="2" face="Verdana">– <i>Células madre:</i> estas células pluripotentes pueden cultivarse en laboratorio y, estimuladas de manera conveniente, son inducidas a diferenciarse en la población celular deseada. En este caso el objetivo sería la obtención de retinas cultivadas <i>in vitro</i> para poder ser posteriormente transplantadas (23). Durante mucho tiempo, se pensó que los único tejidos adultos de donde se podían obtener células madre eran la médula ósea, epitelio de la piel, músculo y del tracto digestivo. Posteriormente, se ha comprobado que se pueden obtener células progenitoras de otros muchos tejidos incluido el ojo (26). A favor de esta estrategia terapéutica está el hecho de que la retina es desde el punto de vista inmunológico, un sitio privilegiado. La entrega de células y tejidos a la retina se ha mostrado claramente factible y, en algunos casos, beneficiosa (27). Sin embargo, los intentos de rescatar la pérdida de fotorreceptores mediante el transplante subretiniano de capas de retina fetal ha sido decepcionante (28). Este tipo de transplantes muestran una baja integración sináptica en la retina huésped y no han funcionado bien en pacientes con RP (29). Se ha comprobado que la capacidad de integración sináptica depende en gran medida del estado de diferenciación de las células transplantadas. Recientemente, el grupo del Prof. Robin Ali, de la Universidad de Londres demostraron que los fotorreceptores postmitóticos se integraban mucho más eficazmente en la retina de ratón que las células progenitoras de la retina no diferenciadas y multipotenciales (23). Este descubrimiento pone de manifiesto que, aunque cada una de estas terapias es muy prometedora, es necesario todavía profundizar más en la biología de la retina para llegar a una terapia racional para las distrofias retinianas.</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><B><font face="Verdana">Agradecimientos</font></B></p>     <p><font size="2" face="Verdana">Nuestro más sincero agradecimiento a todos los pacientes afectados de distrofias retinianas e hipoacusia así como a sus familiares. Estamos en deuda con la Federación de Asociación de Afectados por Retinosis Pigmentaria del Estado Español (FAARPEE) y Fundación ONCE.</font></p>     <p>&nbsp;</p>     <p><B><font face="Verdana">Bibliografía</font></B></p>     <!-- ref --><p><font size="2" face="Verdana">1. Berbari NF, Lewis JS, Bishop GA, Askwith CC, Mykytyn K. Bardet-Biedl syndrome proteins are required for the localization of G protein-coupled receptors to primary cilia. Proc Natl Acad Sci U S A 2008; 105: 4242-4246.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=912591&pid=S0365-6691200800120000300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font size="2" face="Verdana">2. Kremer H, van Wijk E, Märker T, Wolfrum U, Roepman R. Usher syndrome: molecular links of pathogenesis, proteins and pathways. Hum Mol Genet 2006; 15: R262-R270.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=912592&pid=S0365-6691200800120000300002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font size="2" face="Verdana">3. Wills AJ, Manning NJ, Reilly MM. Refsum’s disease. QJM 2001; 94: 403-406.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=912593&pid=S0365-6691200800120000300003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font size="2" face="Verdana">4. Gallo-Teran J, Morales-Angulo C, Rodriguez-Ballesteros M, Moreno-Pelayo MA, del Castillo I, Moreno F. Prevalence of the 35delG mutation in the GJB2 gene, del (GJB6-D13S1830) in the GJB6 gene, Q829X in the OTOF gene and A1555G in the mitochondrial 12S rRNA gene in subjects with non-syndromic sensorineural hearing impairment of congenital/childhood onset. 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Nat Genet 1993; 4: 289-294.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=912696&pid=S0365-6691200800120000300106&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b><a href="#top"><img border="0" src="/img/revistas/aseo/v83n12/seta.gif" width="15" height="17"></a> <a name="bajo"></a></b></font><font face="Verdana"><b><font size="2">Dirección para correspondencia:</font></b><font size="2">    <BR>José M. Millán    <BR>Unidad de Genética    <BR>Hospital Universitario La Fe    <BR>Avda. Campanar, 21    <BR>46009 Valencia    <BR>España    <BR>E-mail: <a href="mailto:millan_jos@gva.es">millan_jos@gva.es</a></font></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Recibido: 12/3/07.    <BR>Aceptado: 24/10/08.</font></p>      ]]></body><back>
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<given-names><![CDATA[X]]></given-names>
</name>
<name>
<surname><![CDATA[Oztas]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Qiu]]></surname>
<given-names><![CDATA[WQ]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Mitochondrial ribosomal RNA mutation associated with both antibiotic-induced and non-syndromic deafness]]></article-title>
<source><![CDATA[Nat Genet]]></source>
<year>1993</year>
<volume>4</volume>
<page-range>289-294</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
